Windows has a well-deserved reputation as a large operating system. A standard installation of Windows XP (with nothing else installed) can easily occupy something in excess of 1.5 Gbytes of disk space. In part, that's because Windows is a general-purpose operating system. As such, it's a kind of kitchen sink software, with all manner of tools, capabilities, and functions thrown into the mix.

That trend started almost a decade ago when Microsoft built HTML rendering functions into Windows: What had previously been part of a separate application--a stand-alone browser--was now inside the operating system and available to any application or utility that wanted to use it.